The CWU, which is Labour’s fifth largest affiliate and the biggest trade union in the communications sector, has backed Leonard, the left candidate in the race. Leonard is believed to be the preferred candidate of Jeremy Corbyn’s office.

Dave Ward, general secretary of the CWU, said: “Richard Leonard is a strong trade unionist and friend of the CWU. Richard strongly supports our union’s fight for the Four Pillars of Security, for universal broadband access for all and for a publicly owned Post Bank.”

“We need a bold agenda for radical change in Scotland and we know that Richard is offering this. We are starting to witness Labour’s message of hope cutting through and we believe Richard Leonard is the man to take it forward”.

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